Quick math help

Can someone please check my math Hw? Thank you!!
Solve each system by elimination.

1. 8x+7y=-1
-9x-7y=2
I got (-1,1)
2. 4x+3y=1
-4x-7y=-13
I got (2,-2)
3. -7x-6y=-21
-x-6y=-3
I got (3,0)
4. -2x+3y=-16
-2x-5y=-16
I got (8,0)
5. -7x+2y=13
-14x+4=26
I got (0,0)
6. 15x-8y=14
-5x+9y=8
I got (2,2)
7. x-6y=22
-2x+3y=1
I got (-8,-5)
8. 2x+10y=30
-10x-6y=-18
I got (0,3)
9. -35x-15y=0
56x+24y=0
I got (0,0)
10. -56x+72y=-16
-49x+63y=-14
I need help with this one!!!

  1. 👍 0
  2. 👎 0
  3. 👁 120
  1. You do not need us to check.
    Put your answers back in the original equations.
    as for #10
    -56x+72y=-16
    -49x+63y=-14

    divide top by 2
    divide second by 7
    -7 x + 9 y = -2
    -7 x + 9 y = -2
    NO solution. This is the same line repeated, no intersection
    In linear algebra if one row is identical to or a multiple of another, the determinant of the coefficient matrix is zero and the solution is undefined.

    1. 👍 0
    2. 👎 0
    posted by Damon
  2. Can you check number 5? Is it no solution?

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Math Homework

    Hello! I need help with these math questions, thanks! :) 1.) Solve the system by substitution. 5x + 2y = -17 x = 3y 2.) Solve the system by substitution. x/3 + y = 4/3 -x + 2y = 11 3.) Solve the system by elimination. 2x - 3y = 0

    asked by Beni on December 7, 2013
  2. algebra

    i need help with these problems (either a solution or how to plug them into a graphing calculator): 1) Solve by substitution or elimination 4/x + 1/y + 2/z = 4 2/x + 3/y - 1/z = 1 1/x + 1/y + 1/z = 4 2)Solve the system of

    asked by Alyssa on April 5, 2011
  3. Math

    Hi, would someone mind just checking the answer I got for this formula and tell me if I'm on the right track or not. Question... x+y=21 3x=4y Answer I got... x=84 y= -63 I didn't get that. Check your math. I found 7y=63 but not y

    asked by Jessica on October 22, 2006
  4. College Algebra

    Please help! x-2y+z=7 2x+y-z=0 3x+2y-2z=-2 a. Solve the above system of equations using Gaussian Elimination or Gauss-Jordan Elimination. You must show row operations. b. Solve the above system of equations using Cramer's Rule.

    asked by Roger on November 17, 2010
  5. Math

    Please help! x-2y+z=7 2x+y-z=0 3x+2y-2z=-2 a. Solve the above system of equations using Gaussian Elimination or Gauss-Jordan Elimination. You must show row operations. b. Solve the above system of equations using Cramer's Rule.

    asked by Angel on November 17, 2010
  6. Math

    Use the method of elimination to solve the following system of equations. You must check your answer: 1)x/2 + y/5 = 1/2 2) 3x - y = -8

    asked by Danielle on January 19, 2013
  7. algebra

    Solve the system using elimination X+3y=5 4x+4y=4 I tried to work this problem and this is what I came up with. x+3y=5 x+4y=20 7y=15 y=7/15 and x= (5+y)/4 (5+7/15)/2 2/15 x=2/15 x=2/15, y=7/15 I would like for someone to check to

    asked by angela on July 15, 2013
  8. Discrete Math

    I am really stuck on these problems. I've worked a lot of them but I can't get these. Sometimes I think I know the answer but I can't show how I got it. 1.) Solve each matrix equation for X. 2X + 5A = B 2.) Find the following

    asked by Ryan on February 25, 2010
  9. algebra

    I just need a quick check before I hand in my work if you would...Thanks. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1),

    asked by S on January 8, 2010
  10. Math

    Use elimination to solve each system of equations. x+y-2z=10 8x-9y-z=5 3x+4y+2z=-10 I need to figure out what x,y, and z each equal. I must use the elimination method.

    asked by Karli on January 11, 2010

More Similar Questions